The Retail Inventory Method Is Based on the Assumption That

The retail inventory method is based on the assumption that the

A) final inventory and the total of goods available for sale contain the same proportion of high-cost and low-cost ratio goods.
B) ratio of gross margin to sales is approximately the same each period.
C) ratio of cost to retail changes at a constant rate.
D) proportions of markups and markdowns to selling price are the same.